Wasn't there already Jabber or IRC? But they don't make money. Sad world where we prefer badly coded shit that makes money, to awesome tech that don't.
Apart from the sarcasm, I'm serious on the web part, which is terrible: all around the world people are "porting" protocols to JSON+HTTP ( example: JMAP[1] ). IRC is awesome[2], but it's not GET & POST and the new kids on the block run away if it's a real protocol instead of a HTTP hack.
[1]: http://jmap.io/
[2]: https://aaronparecki.com/2015/08/29/8/why-i-live-in-irc
You could run any application on any port: IRC on port 80 with SSL would still run just fine.
You can run whatever you want however you want, but that doesn't change the reality of the enterprise environment.
Do you want your boss to see your reddit history?